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豫西晚太古代含铁建造,虽然普受中压型角闪岩相变质作用,但因生成环境不同仍显示出变质程度的差异,下面以午阳和许昌为例加以说明。 午阳晚太古代含铁建造可分为下部赵案庄组和上部铁山庙组,前者由斜长角闪岩和片麻岩类岩石组成;而后者除有上述岩类外,下部有大量的大理岩,上部有多量的云母片岩。两组
The Late Archean iron-bearing construction in the western Henan Province, though generally controlled by medium-pressure amphibolite facies metamorphism, shows differences in metamorphism due to different environments. The following examples are given by the examples of the lunar and Xuchang periods. The Late Archean Archean iron-bearing construction can be divided into the lower Zhaozhuangzhuang Formation and the upper Tieshunmiao Formation, the former being composed of amphibolite and gneiss rocks; while the latter, in addition to the above-mentioned rocks, has a large number of lower parts Of the marble, the upper part of the mica schist. Two groups